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Automobiles
containing
气坑
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工作面凹坑不对称以挤压充气的转子
beetle rotor
活塞顶上
气门凹坑
valve relief
(piston relief)
活塞顶上
气门凹坑
为防止活塞到达上止点时与气门干涉而设置
valve recess
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